Transducer Flush Mounted In A Steel Tank - Simrad ES70 - INSTALLATION REV A Installation Manual

Simrad ES70
Use a horizontal support bar on large transducers
We strongly recommend that large transducers are fitted with a horizontal support bar.
The purpose of this support bar is to protect the transducer from damage in the event of
slamming. This happens if the vessel hull climbs out of the water in heavy seas. The
force of the water when the hull falls down may push the transducer up and cause damage
to its mounting. The support bar can be secured to the mounting ring using threaded rods.
Slamming is the impact of the bottom structure of a ship onto the sea surface. It
is mainly observed while sailing in waves, when the bow raises from the water
and subsequently impacts on it. Slamming induces extremely high loads to ship
structures and is taken under consideration when designing ships.
Example: Box keel installation
The figure below illustrates a symmetrical box keel installation.
Figure 32 Box keel installation
Box keel
A
U-shaped
B
support
bar (only
recommended
on large
transducers)
C Stuffing tube
D Cable in steel
conduit
E Cable service
loop

Transducer flush mounted in a steel tank

Flush mounting is used on very large vessels with a hull so deep that no air bubbles are
found below the hull, and on vessels operating in shallow harbours or waters, where
a protruding blister can not be accepted.
The standard procedure for flush mounting on a steel vessel is to weld a steel tank inside
the hull, and mount the transducer into this tank.
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